Question: Which sovereign state has the highest central government debt as a percent of GDP?
Paraphrase: What nation has the highest federal debt per percent of GDP?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q3624078 . ?ent wdt:P1689 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: Australia, Australia